Clamp



FIG. 1 is a front, top and right side perspective view of the design;

FIG. 2 is a front elevational view showing the design;

FIG. 3 is a rear elevational view of the design;

FIG. 4 is a top plan view of the design;

FIG. 5 is a bottom plan view of the design;

FIG. 6 is a left side elevational view of the design; and,

FIG. 7 is a right side elevational view of the design.

The broken lines depict portions of the clamp that form no part of the claimed design. 

The ornamental design for clamp, as shown and described. 